WOMS
C code chassis Medium severity

C0660 Level Control Exhaust Valve Circuit Malfunction

The OBD2 code C0660 indicates a malfunction in the level control exhaust valve circuit, which is part of the vehicle's air suspension system

Definition

The OBD2 code C0660 indicates a malfunction in the level control exhaust valve circuit, which is part of the vehicle's air suspension system

Common causes

  • Faulty exhaust valve
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Failed level control module
  • Malfunctioning air suspension system
  • Blocked or damaged air lines
  • Faulty pressure sensor
  • Software issues in the vehicle's control module

Common misdiagnoses

  • Air suspension compressor failure
  • Level sensor malfunction
  • Wiring or connector issues
  • Control module failure
  • Air spring leaks
  • Faulty relay or fuse
  • Suspension control module issues
  • Incorrectly calibrated suspension system
  • Software or programming errors
  • Other suspension component failures

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Look for any damaged, frayed, or corroded wires and connectors related to the level control exhaust valve circuit

  3. 3. Connector Condition

    Ensure that all connectors are securely attached and free of corrosion or dirt

  4. 4. Test the Level Control Exhaust Valve

    Functionality Test: If accessible, manually test the level control exhaust valve to see if it operates correctly. This may involve applying power directly to the valve to see if it opens and closes as expected

  5. 5. Resistance Check

    Use a multimeter to measure the resistance of the valve. Compare the readings to the manufacturer’s specifications

  6. 6. Check the Power and Ground Supply

    Voltage Test: Use a multimeter to check if the valve is receiving the correct voltage when the vehicle is in the appropriate mode (e.g., ignition on)

  7. 7. Ground Check

    Ensure that the ground connection for the valve is solid and free of corrosion

  8. 8. Inspect the Level Control Module

    If the vehicle has a dedicated level control module, check for any faults or issues within the module itself. This may involve checking for software updates or resets

  9. 9. Look for Air Leaks

    If the level control system is pneumatic, inspect for any air leaks in the system that could affect operation

  10. 10. Check for Mechanical Issues

    Inspect the suspension components and any related parts to ensure there are no mechanical issues affecting the level control system

  11. 11. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle, as there may be known issues or recalls that could be relevant

  13. 13. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its systems.Conclusion By following these troubleshooting steps, you can systematically identify and address the cause of the C0660 code. Always refer to the vehicle’s service manual for specific procedures and specifications related to the level control exhaust valve circuit